Walter Koenig was slated to appear again in the Babylon 5 spin-off, Crusade, but the show was canceled before it could happen, which is a shame, as given how far he fell by the end of the show ...

It can be a dangerous place, but it's our last best hope for peace. This is the story of the last of the Babylon stations. The year is 2258. The name of the place is Babylon 5.